Java Pearls: Why not copy the attribute’s value onto itself

I like it, when values are set into attributes from where they have been fetched. Makes for readable code.

UserBean deputyChange = myTransferObject.getDeputy();
if (deputyChange != null && deputyChange.getUid() != null) {
  if (!checkUserRole(deputyChange.getUid(), FunctionGroups.ROLE_TO_CHECK.getRole())) {
    throw new IllegalArgumentException("Deputy user-id not valid: " + deputyChange.getUid());

Apart from the fact that the webapplications user gets a nice looking Exception Message in his browser if he selected the wrong user from a list… It really makes sense to set the originating attribute to the value it delivered just a few lines above…

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